feather SIM800H


im using this module.

and i looked at its datasheet here

and ont page 190 it says it can detect interference on the signal, possible a jammer. i configured the APN and activate the GPRS, got an IP too and test the SMS send. i have a jammer so i test it with it but the SIM doesnt show up anything diferent from +SJDR: NO JAMMING

i configures diferent thresholds but no change like this command


it respond ok, the last 0 shows on the serial the status of the interference every 3000ms but it always says +SJDR: NO JAMMING. i know the jammer works cuz it also afects the wifi and my cellphone.

i hope anyone test this function before and can help me

i could make it work with the sim900 maybe its an issue on the firmware